Articles | Volume 18, issue 8
https://doi.org/10.5194/bg-18-2573-2021
https://doi.org/10.5194/bg-18-2573-2021
Research article
 | 
22 Apr 2021
Research article |  | 22 Apr 2021

Decoupling salinity and carbonate chemistry: low calcium ion concentration rather than salinity limits calcification in Baltic Sea mussels

Trystan Sanders, Jörn Thomsen, Jens Daniel Müller, Gregor Rehder, and Frank Melzner

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Latest update: 20 Nov 2024
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Short summary
The Baltic Sea is expected to experience a rapid drop in salinity and increases in acidity and warming in the next century. Calcifying mussels dominate Baltic Sea seafloor ecosystems yet are sensitive to changes in seawater chemistry. We combine laboratory experiments and a field study and show that a lack of calcium causes extremely slow growth rates in mussels at low salinities. Subsequently, climate change in the Baltic may have drastic ramifications for Baltic seafloor ecosystems.
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